On my desktop, my shop's 180 sweaters are visible.
BUT, when I use the Etsy App (mine and husband's), only 1 item shows...my one apron listing. YIKES !
I don't use the App, but many Buyers do. And as a Buyer, you search, browse, etc. And if you don't find what you're looking for, you bolt and move on. You don't dickey doodle around with uninstalling/reinstalling Apps; or sorting by Recent (in order to see all items, as you said). Buyers cannot purchase that which they cannot see. As far as an engineering team working on the issue, I'm sorry but that's most likely a way to blow you off, and Buyers don't care about things like engineering issues. If they don't see what they want, they certainly can't buy it.
Sadly, the problem continues with low or no visibility on the Etsy App.
Time to deactivate and then reactivate my items to get "out of the weeds" of invisibility.